The Transport Layer Security (TLS) Protocol Version 1.3
RFC 8446

Document Type RFC - Proposed Standard (August 2018; Errata)
Last updated 2018-08-28
Replaces draft-ietf-tls-rfc5246-bis
Stream IETF
Formats plain text pdf html bibtex
Reviews
Stream WG state Submitted to IESG for Publication (wg milestone: Feb 2017 - (D)TLS 1.3 to IESG... )
Document shepherd Sean Turner
Shepherd write-up Show (last changed 2018-03-01)
IESG IESG state RFC 8446 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Kathleen Moriarty
Send notices to Sean Turner <sean@sn3rd.com>
IANA IANA review state IANA OK - Actions Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                       E. Rescorla
Request for Comments: 8446                                       Mozilla
Obsoletes: 5077, 5246, 6961                                  August 2018
Updates: 5705, 6066
Category: Standards Track
ISSN: 2070-1721

        The Transport Layer Security (TLS) Protocol Version 1.3

Abstract

   This document specifies version 1.3 of the Transport Layer Security
   (TLS) protocol.  TLS allows client/server applications to communicate
   over the Internet in a way that is designed to prevent eavesdropping,
   tampering, and message forgery.

   This document updates RFCs 5705 and 6066, and obsoletes RFCs 5077,
   5246, and 6961.  This document also specifies new requirements for
   TLS 1.2 implementations.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8446.

Rescorla                     Standards Track                    [Page 1]
RFC 8446                           TLS                       August 2018

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Rescorla                     Standards Track                    [Page 2]
RFC 8446                           TLS                       August 2018

Table of Contents

   1. Introduction ....................................................6
      1.1. Conventions and Terminology ................................7
      1.2. Major Differences from TLS 1.2 .............................8
      1.3. Updates Affecting TLS 1.2 ..................................9
   2. Protocol Overview ..............................................10
      2.1. Incorrect DHE Share .......................................14
      2.2. Resumption and Pre-Shared Key (PSK) .......................15
      2.3. 0-RTT Data ................................................17
   3. Presentation Language ..........................................19
      3.1. Basic Block Size ..........................................19
      3.2. Miscellaneous .............................................20
      3.3. Numbers ...................................................20
      3.4. Vectors ...................................................20
      3.5. Enumerateds ...............................................21
      3.6. Constructed Types .........................................22
      3.7. Constants .................................................23
      3.8. Variants ..................................................23
   4. Handshake Protocol .............................................24
      4.1. Key Exchange Messages .....................................25
           4.1.1. Cryptographic Negotiation ..........................26
           4.1.2. Client Hello .......................................27
           4.1.3. Server Hello .......................................31
           4.1.4. Hello Retry Request ................................33
      4.2. Extensions ................................................35
           4.2.1. Supported Versions .................................39
           4.2.2. Cookie .............................................40
Show full document text